A stack testing device and system with online air tightness detection function

Abstract

The embodiment of the present invention provides a stack test device and system with an online air tightness detection function, which relates to the field of fuel cells. The test device is based on a conventional test bench, and adds an air tightness detection unit, including a first pipeline that can be switched on and off, a second pipeline that can be switched on and off, a third pipeline that can be switched on and off, a fourth pipeline that can be switched on and off, a fifth pipeline that can be switched on and off, a sixth pipeline that can be switched on and off, a seventh pipeline and a proportional valve and a flow meter. The first pipeline is connected to the air inlet of the hydrogen chamber, the second pipeline is connected to the air outlet of the hydrogen chamber, the third pipeline is connected to the air inlet of the air chamber, the fourth pipeline is connected to the air outlet of the air chamber, the fifth pipeline is connected to the inlet of the coolant chamber, the sixth pipeline is connected to the outlet of the coolant chamber, one end of the seventh pipeline is connected to the gas source, and the other end of the seventh pipeline is connected to the first pipeline, the third pipeline and the fifth pipeline. The test device can realize the detection of the air tightness and power generation performance of the stack, and can improve the test efficiency.

Description

Technical Field

[0001] The present invention relates to the field of fuel cells, and in particular to a fuel cell stack testing device and system with an online air tightness detection function. Background Art

[0002] The airtightness of a fuel cell stack (referred to as the stack) is an important parameter for stack evaluation, which directly affects the performance, life and operational safety of the stack. Therefore, it is of great significance to conduct airtightness testing on the stack.

[0003] At present, the gas tightness test of the fuel cell stack is generally carried out before the fuel cell stack is installed on the fuel cell stack power generation performance test bench. The test items include external leakage detection of the entire fuel cell stack, hydrogen cavity leakage detection, air cavity leakage detection, hydrogen cavity and air cavity leakage detection, hydrogen cavity and coolant cavity leakage detection, air cavity and coolant cavity leakage detection, etc. Once the fuel cell stack is installed on the fuel cell stack performance test bench for fuel cell stack power generation performance test, the gas tightness of the fuel cell stack can no longer be tracked and tested. In this way, during the fuel cell stack life test of several thousand hours or more, it is impossible to obtain the changes in the gas tightness of the fuel cell stack in different time periods, and a criterion for subsequent analysis of the fuel cell stack life attenuation factor is lost. If the fuel cell stack is removed from the performance test bench several times during the fuel cell stack power generation performance test in order to test the changes in the gas tightness of the fuel cell stack over time, it is not only time-consuming and inefficient, but also brings uncertainty to the fuel cell stack life test. Summary of the invention

[0004] The object of the present invention is to provide a fuel cell stack testing device and system having both the functions of online detection of fuel cell stack air tightness and detection of fuel cell stack power generation performance, which can effectively improve the above-mentioned technical problems.

[0005] The embodiment of the present invention is achieved as follows:

[0006] In a first aspect, an embodiment of the present invention provides a test device, which adds an airtightness detection unit on the basis of a conventional test bench, and is used to test the airtightness of a fuel cell stack. The fuel cell stack has a hydrogen cavity, an air cavity, and a coolant cavity that are isolated from each other, and the airtightness detection unit of the test device includes:

[0007] A first pipeline that can be switched on and off, one end of which is used to communicate with the gas inlet of the hydrogen chamber;

[0008] A second pipeline that can be switched on and off, one end of which is used to communicate with the gas outlet of the hydrogen chamber;

[0009] A third pipeline that can be switched on and off, one end of the third pipeline being used to communicate with the air inlet of the air cavity;

[0010] a fourth pipeline which can be switched on and off, one end of which is used to communicate with the air outlet of the air cavity;

[0011] a fifth pipeline which can be switched on and off, one end of which is used to communicate with the inlet of the cooling liquid chamber;

[0012] a sixth pipeline which can be switched on and off, one end of which is used to communicate with the outlet of the cooling liquid chamber;

[0013] a seventh pipeline, one end of which is used to communicate with the gas source, and the other end of which is simultaneously connected with the other end of the first pipeline, the other end of the third pipeline, and the other end of the fifth pipeline;

[0014] a proportional valve disposed on the seventh pipeline, the proportional valve being used to adjust the pressure of the gas in the seventh pipeline;

[0015] A flow meter is arranged on the seventh pipeline, and the flow meter is used to test the flow of the gas in the seventh pipeline.

[0016] In an optional embodiment, the number of the proportional valves is at least two, at least two of the proportional valves are arranged in parallel on the seventh pipeline, and the maximum values ​​of the gas pressures that can be adjusted by the two proportional valves are different, corresponding to the pressures of the gas in different fuel cell chambers.

[0017] In an optional embodiment, the number of the flow meters is at least two, at least two of the flow meters are arranged in parallel on the seventh pipeline, and the measuring ranges of two of the flow meters are different.

[0018] In an optional embodiment, the air tightness detection unit of the testing device also includes a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve and a seventh valve, the first valve is arranged on the first pipeline to control the on-off of the first pipeline, the second valve is arranged on the second pipeline to control the on-off of the second pipeline, the third valve is arranged on the third pipeline to control the on-off of the third pipeline, the fourth valve is arranged on the fourth pipeline to control the on-off of the fourth pipeline, the fifth valve is arranged on the fifth pipeline to control the on-off of the fifth pipeline, the sixth valve is arranged on the sixth pipeline to control the on-off of the sixth pipeline, and the seventh valve is arranged on the seventh pipeline to control the on-off of the seventh pipeline.

[0019] In an optional embodiment, the air tightness detection unit of the testing device also includes a first pressure gauge, a second pressure gauge and a third pressure gauge. The first pressure gauge is arranged on the first pipeline to test the pressure value of the gas at the inlet of the hydrogen chamber connected to the first pipeline. The second pressure gauge is arranged on the third pipeline to test the pressure value of the gas at the inlet of the air chamber connected to the third pipeline. The third pressure gauge is arranged on the fifth pipeline to test the pressure value of the gas at the inlet of the coolant chamber connected to the fifth pipeline.

[0020] In an optional embodiment, the air tightness detection unit of the test device further includes a first one-way valve, which is disposed on the seventh pipeline and is used to prevent air from entering the seventh pipeline during routine performance testing of the fuel cell stack.

[0021] In an optional embodiment, the air tightness detection unit of the testing device also includes an eighth pipeline and an eighth valve, one end of the eighth pipeline is connected to the first pipeline, the other end of the eighth pipeline is connected to the third pipeline and the fifth pipeline, and the eighth valve is arranged on the eighth pipeline, and the eighth valve is used to control the on and off of the eighth pipeline.

[0022] In an optional embodiment, the air tightness detection unit of the testing device also includes a second one-way valve, which is arranged on the eighth pipeline, and the second one-way valve is used to prevent the fluid in the third pipeline and the fifth pipeline from flowing into the first pipeline through the eighth pipeline.

[0023] In an optional embodiment, the testing device further includes a flow regulator, which is disposed on the seventh pipeline and is used to regulate the flow of the gas in the seventh pipeline.

[0024] In a second aspect, an embodiment of the present invention provides a testing system, including the testing device described in any one of the aforementioned embodiments, which can test both the air tightness of the fuel cell stack and the power generation performance of the fuel cell stack.

[0025] The beneficial effects of the embodiments of the present invention include, for example:

[0026] An embodiment of the present invention provides a fuel cell stack testing device that has both the functions of online detection of fuel cell stack air tightness and detection of fuel cell stack power generation performance. The testing device adds an air tightness detection unit on the basis of a conventional fuel cell stack test bench, which can realize online detection of fuel cell stack air tightness and test the power generation performance of the fuel cell stack.

[0027] An embodiment of the present invention further provides a testing system, which includes the testing device mentioned above. The testing system can effectively save testing costs and improve testing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 A schematic diagram of the structure of a test system provided by an embodiment of the present invention;

[0030] Figure 2 A schematic diagram of a process flow for hydrogen chamber air tightness testing provided by an embodiment of the present invention;

[0031] Figure 3 A schematic diagram of a flow chart of a cross-leakage test between an air cavity and a hydrogen cavity provided in an embodiment of the present invention;

[0032] Figure 4 A schematic diagram of a flow chart of a cooling liquid chamber and a hydrogen chamber leakage test provided by an embodiment of the present invention;

[0033] Figure 5 A schematic diagram of the flow chart of the entire battery stack leakage test provided in an embodiment of the present invention.

[0034] Icons: 1-test system; 11-fuel cell; 111-hydrogen chamber; 112-air chamber; 113-coolant chamber; 12-air tightness detection unit; 13-test device; 121-first pipeline; 122-second pipeline; 123-third pipeline; 124-fourth pipeline; 125-fifth pipeline; 126-sixth pipeline; 127-seventh pipeline; 128-eighth pipeline; 129-ninth pipeline; 130-tenth pipeline; 131-flow meter; 132-proportional valve; 133-first valve ;134-second valve;135-third valve;136-fourth valve;137-fifth valve;138-sixth valve;139-seventh valve;140-eighth valve;141-ninth valve;142-tenth valve;150-eleventh valve;143-first pressure gauge;144-second pressure gauge;145-third pressure gauge;146-first one-way valve;147-second one-way valve;148-flow regulator;149-coolant circulation unit;2-gas source;31-hydrogen source;32-air source. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0039] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0040] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Please refer to Figure 1The present embodiment provides a test system 1, which includes a test device 13, which includes an airtightness detection unit 12 and a conventional test bench part. The test device 13 can realize online testing of the airtightness of the battery stack 11. Generally, the airtightness test items of the battery stack 11 include a hydrogen cavity 111 test, an air cavity 112 test, a coolant cavity 113 test, a hydrogen cavity 111 and an air cavity 112 mutual series test, a hydrogen cavity 111 and a coolant cavity 113 mutual series test, an air cavity 112 and a coolant cavity 113 mutual series test, and a leakage test of the entire battery stack. The test process of some items will be described in detail later.

[0042] Combination Figure 1 In this embodiment, the battery stack 11 has a hydrogen cavity 111, an air cavity 112 and a coolant cavity 113 that are isolated from each other. It should be noted that the hydrogen cavity 111 is a cavity through which hydrogen enters during normal discharge of the battery stack 11. Similarly, the air cavity 112 is a cavity through which air enters during normal discharge of the battery stack 11. The coolant cavity 113 is a cavity through which coolant enters during normal discharge of the battery stack 11. The coolant cools the interior of the battery stack 11. With regard to the normal discharge process of the battery stack 11, relevant technologies are involved, which will not be described in detail here.

[0043] Combination Figure 1 In this embodiment, the air tightness detection unit 12 of the testing device 13 also includes a first pipeline 121, a second pipeline 122, a third pipeline 123, a fourth pipeline 124, a fifth pipeline 125, a sixth pipeline 126 and a seventh pipeline 127. When performing an air tightness test, different air tightness test items can be tested by controlling the on / off of the seventh pipeline and the first pipeline 121, the second pipeline 122, the third pipeline 123, the fourth pipeline 124, the fifth pipeline 125 and the sixth pipeline 126.

[0044] Specifically, in this embodiment, one end of the first pipeline 121 is connected to the air inlet of the hydrogen cavity 111, one end of the second pipeline 122 is connected to the air outlet of the hydrogen cavity 111, one end of the third pipeline 123 is connected to the air inlet of the air cavity 112, one end of the fourth pipeline 124 is connected to the air outlet of the air cavity 112, one end of the fifth pipeline 125 is connected to the inlet of the cooling liquid cavity 113, and one end of the sixth pipeline 126 is connected to the outlet of the cooling liquid cavity 113, and one end of the seventh pipeline 127 is selectively connected to the gas source 2 or the hydrogen source 31, and the other end of the seventh pipeline 127 is simultaneously connected to the other end of the first pipeline 121, the other end of the third pipeline 123 and the other end of the fifth pipeline 125.

[0045] In this way, by setting the opening and closing of the first pipeline 121 , the third pipeline 123 and the fifth pipeline 125 , the test gas output by the gas source 2 can enter the hydrogen cavity 111 , the air cavity 112 or the cooling liquid cavity 113 .

[0046] It should be noted that Figure 1 For example, the hydrogen source 31 and the air source 32 are parts of a conventional test bench, which are all involved in the relevant technology and will not be described in detail here.

[0047] In this embodiment, nitrogen is selected as the test gas from the gas source 2. In other embodiments, helium or hydrogen may also be selected as the test gas.

[0048] Please refer to Figure 1 In this embodiment, the air tightness detection unit 12 of the test device 13 further includes a proportional valve 132, which is disposed on the seventh pipeline 127. By controlling the proportional valve 132, the pressure value of the inlet of the hydrogen chamber 111 connected to the first pipeline 121, the pressure value of the inlet of the air chamber 112 connected to the third pipeline 123, and the pressure value of the inlet of the cooling liquid chamber 113 connected to the fifth pipeline 125 can be adjusted. In this way, different pressure values ​​can be set according to different air tightness test requirements, and at the same time, the situation that the hydrogen chamber 111, the air chamber 112 or the cooling liquid chamber 113 is damaged due to excessive test gas pressure can be avoided.

[0049] Please refer to Figure 1 In this embodiment, the air tightness detection unit 12 further includes a flow meter 131 , which is disposed on the seventh pipeline 127 , and the flow meter 131 can test the flow in the seventh pipeline 127 .

[0050] Combination Figure 1 and Figure 2 When testing the air tightness of the hydrogen chamber, the test steps include:

[0051] S11: connect the first pipeline 121 , the fourth pipeline 124 , and the sixth pipeline 126 , and disconnect the second pipeline 122 , the third pipeline 123 , and the fifth pipeline 125 .

[0052] S12: Control the gas source 2 to introduce test gas into the seventh pipeline 127 .

[0053] S13: Control the proportional valve 132 to set the test gas pressure in the first pipeline 121 to 40 kPa, and continue the test for 5 minutes.

[0054] S14: Record the data of the flow meter 131.

[0055] It should be noted that when performing the air tightness test of the hydrogen chamber, the leakage rate read by the flow meter 131 is the air tightness data of the hydrogen chamber. It is understandable that if the leakage rate read is greater than the preset value, it means that the air tightness of the hydrogen chamber 111 is poor. The preset value can be set according to actual conditions.

[0056] It should be noted that, in this embodiment, the purpose of connecting the fourth pipeline 124 and the sixth pipeline 126 is to ensure that the gas in the air cavity 112 and the coolant cavity 113 can be discharged, and the third pipeline 123 and the fifth pipeline 125 are disconnected, so that the test gas in the seventh pipeline 127 can only enter the hydrogen cavity 111 through the first pipeline 121, and the second pipeline 122 is disconnected, so that the test gas entering the hydrogen cavity 111 cannot be discharged through the second pipeline 122. In other words, the flow meter 131 displays a flow value, which is the airtightness data of the hydrogen cavity 111.

[0057] Similarly, combining Figure 1 and Figure 3 When testing the cross-leakage between the air cavity 112 and the hydrogen cavity 111, the testing steps include:

[0058] S21: connect the second pipeline 122, the third pipeline 123 and the eighth pipeline 128, and disconnect the first pipeline 121, the fourth pipeline 124, the fifth pipeline 125 and the sixth pipeline 126.

[0059] S22: Control the gas source 2 to introduce test gas into the seventh pipeline 127 .

[0060] S23: Control the proportional valve 132 to limit the inlet pressure of the third pipeline air cavity 112 to 50 kPa, and continue the test for 3 minutes.

[0061] S24: Record the data of the flow meter 131.

[0062] Similar to the air tightness test process of the hydrogen cavity, at this time, the leakage rate read by the flow meter 131 is the data of the gas cross-talk between the air cavity 112 and the hydrogen cavity 111 .

[0063] It should be noted that, in the present embodiment, the purpose of connecting the second pipeline 122 is that if there is a leakage, the gas entering the air cavity 112 will leak from the hydrogen cavity 111, and the first pipeline 121 and the fifth pipeline 125 are disconnected, so that the test gas in the seventh pipeline 127 can only enter the air cavity 112 through the eighth pipeline 128 and the third pipeline 123, and the fourth pipeline 124 and the sixth pipeline 126 are disconnected, so that the test gas entering the air cavity 112 cannot be discharged through the fourth pipeline 124, nor can it be discharged through the sixth pipeline 126. In other words, if the flow meter 131 has a flow value displayed, it can be determined that the test gas in the air cavity 112 is discharged through the second pipeline 122, so it can be inferred that there is a mutual connection between the air cavity 112 and the hydrogen cavity 111.

[0064] Combination Figure 1 and Figure 4 When testing the leakage between the cooling liquid chamber 113 and the hydrogen chamber 111, the testing steps include:

[0065] S31: connect the second pipeline 122, the fifth pipeline 125 and the eighth pipeline 128, and disconnect the first pipeline 121, the third pipeline 123, the fourth pipeline 124 and the sixth pipeline 126.

[0066] S32: Control the gas source 2 to introduce test gas into the seventh pipeline 127 .

[0067] S33: Control the proportional valve 132 to limit the test gas pressure at the inlet of the cooling liquid chamber 113 of the fifth pipeline 125 to 100 kPa, and continue the test for 3 minutes.

[0068] S34: Record the data of the flow meter 131.

[0069] Similar to the airtightness test process of the hydrogen chamber, at this time, the leakage rate read by the flow meter 131 is the airtightness data between the cooling liquid chamber 113 and the hydrogen chamber 111 .

[0070] It should be noted that, in this embodiment, the purpose of connecting the second pipeline 122 is to discharge the leaked gas from the hydrogen chamber 111, the first pipeline 121 and the third pipeline 123 are disconnected, so that the test gas in the seventh pipeline 127 can only enter the cooling liquid chamber 113 through the fifth pipeline 125 and the eighth pipeline 128, and the fourth pipeline 124 and the sixth pipeline 126 are disconnected, so that the test gas entering the cooling liquid chamber 113 cannot be discharged through the sixth pipeline 126, nor can it be discharged through the fourth pipeline 124. In other words, if the flow meter 131 displays a flow value, it can be determined that the test gas in the cooling liquid chamber 113 is discharged through the second pipeline 122, so it can be inferred that there is a mutual connection between the cooling liquid chamber 113 and the hydrogen chamber 111.

[0071] Combination Figure 1 and Figure 5 When testing the leakage of the battery stack 11, the test steps include:

[0072] S41: connect the first pipeline 121 , the third pipeline 123 , the fifth pipeline 125 , and the eighth pipeline 128 , and disconnect the second pipeline 122 , the fourth pipeline 124 , and the sixth pipeline 126 .

[0073] S42: Control the gas source 2 to introduce test gas into the seventh pipeline 127 .

[0074] S43: Control the proportional valve 132 to set the test gas pressures of the hydrogen chamber 111 inlet connected to the first pipeline 121, the air chamber 112 inlet connected to the third pipeline 123, and the coolant chamber 113 inlet connected to the fifth pipeline 125 to 100 kPa, and continue the test for 8 minutes.

[0075] S44: Record the data of the flow meter 131.

[0076] At this time, the leakage rate read by the flow meter 131 is the external leakage rate of the fuel cell stack 11 .

[0077] It should be noted that, in this embodiment, the first pipeline 121 is connected, the third pipeline 123 is connected, the fifth pipeline 125 is connected, and the eighth pipeline 128 is connected, so that the test gas enters the hydrogen chamber, the air chamber, and the coolant chamber at the same time, and the second pipeline 122 is disconnected, the fourth pipeline 124 is disconnected, and the sixth pipeline 126 is disconnected, so that the test gas cannot be discharged through these pipelines. In other words, the flow value recorded by the flow meter 131 is the airtightness of the entire stack 11. If the seal between the cathode plate and the anode plate in the stack 11 is not good or the seal between the bipolar plate and the membrane electrode is not good, the airtightness of the entire stack will be poor.

[0078] In this way, combined Figure 1-Figure 5 In this embodiment, by changing the on / off state of the first pipeline 121, the second pipeline 122, the third pipeline 123, the fourth pipeline 124, the fifth pipeline 125, the sixth pipeline 126 and the eighth pipeline 128, various air tightness test items of the fuel cell stack 11 can be tested without repeatedly disassembling the fuel cell stack 11 from the test bench, which can effectively save test costs and improve test efficiency.

[0079] Please refer to Figure 1In this embodiment, the test device 13 further includes a first valve 133, a second valve 134, a third valve 135, a fourth valve 136, a fifth valve 137 and a sixth valve 138. The first valve 133 is arranged on the first pipeline 121, and the first valve 133 can control the on-off of the first pipeline 121. The second valve 134 is arranged on the second pipeline 122, and the second valve 134 can control the on-off of the second pipeline 122. The third valve 135 is arranged on the third pipeline 123, and the third valve 135 can Control the on-off of the third pipeline 123, the fourth valve 136 is set on the fourth pipeline 124, the fourth valve 136 can control the on-off of the fourth pipeline 124, the fifth valve 137 is set on the fifth pipeline 125, the fifth valve 137 can control the on-off of the fifth pipeline 125, the sixth valve 138 is set on the sixth pipeline 126, the sixth valve 138 can control the on-off of the sixth pipeline 126, the eighth valve 140 is set on the eighth pipeline 128, the eighth valve 140 can control the on-off of the eighth pipeline 128.

[0080] Please refer to Figure 1 In this embodiment, the test device 13 further includes a seventh valve 139, which is disposed on the seventh pipeline 127 and can control the on-off of the seventh pipeline 127. In this way, it is convenient to control the test gas to enter the seventh pipeline 127.

[0081] In other embodiments, the seventh valve 139 may not be provided on the seventh pipeline 127 .

[0082] It should be noted that, in the present embodiment, the first valve 133 , the second valve 134 , the third valve 135 , the fourth valve 136 , the fifth valve 137 , the sixth valve 138 and the seventh valve 139 are all solenoid valves for easy opening or closing.

[0083] Please refer to Figure 1 In this embodiment, the test device 13 further includes a first one-way valve 146, which is disposed on the seventh pipeline 127. In this way, the first one-way valve 146 can prevent gas from entering the seventh pipeline 127 from the air source 32 during the conventional power generation performance test of the stack.

[0084] According to the above test process, it can be inferred that when performing different air tightness test items, the set pressure of the proportional valve 132 is different. Please refer to Figure 1 In this embodiment, there are two proportional valves 132 , and the two proportional valves 132 are arranged in parallel on the seventh pipeline 127 , wherein the maximum values ​​of the gas pressures that can be adjusted by the two proportional valves 132 are different.

[0085] In this way, when performing different air tightness test items, different proportional valves 132 can be used according to different required pressures, so that the required inlet pressures of the hydrogen chamber 111, the air chamber 112 and the cooling liquid chamber 113 reach the set values.

[0086] It should be noted that, in other embodiments, the number of the proportional valves 132 may also be two, three, etc.

[0087] Please refer to Figure 1 In this embodiment, the number of the flow meters 131 is three, and the three flow meters 131 are arranged in parallel on the seventh pipeline 127, and the measuring ranges of the three flow meters 131 are different.

[0088] It is understandable that when the flow in the seventh pipeline 127 is large, a flow meter 131 with a larger range can be used for measurement, and when the flow in the seventh pipeline 127 is small, a flow meter 131 with a smaller range can be used for measurement.

[0089] In other embodiments, the number of the flow meters 131 may also be four, five, etc. The flow meters 131 have different measuring ranges to achieve the purpose of measuring flow rates of different magnitudes.

[0090] Please refer to Figure 1 In this embodiment, the test device 13 further includes a flow regulator 148, which is disposed on the seventh pipeline 127. It is understandable that the flow regulator 148 can adjust the flow in the seventh pipeline 127, and the specific structure of the flow regulator 148 is involved in the relevant technology and will not be repeated here.

[0091] Please refer to Figure 1 In this embodiment, the testing device 13 also includes a first pressure gauge 143, a second pressure gauge 144 and a third pressure gauge 145. The first pressure gauge 143 is arranged on the first pipeline 121, the second pressure gauge 144 is arranged on the third pipeline 123, and the third pressure gauge 145 is arranged on the fifth pipeline 125.

[0092] It can be understood that when performing air tightness testing, the first pressure gauge 143 can detect the pressure value of the gas in the first pipeline 121, the second pressure gauge 144 can detect the pressure value of the gas in the third pipeline 123, and the third pressure gauge 145 can detect the pressure value of the gas in the fifth pipeline 125.

[0093] The staff can check according to the value measured by the first pressure gauge 143 to determine whether the pressure of the test gas entering the hydrogen chamber 111 reaches the first predetermined pressure value. If it does not reach the first predetermined pressure value, the proportional valve 132 can be adjusted again so that the pressure value of the test gas entering the hydrogen chamber 111 finally meets the requirement. Similarly, the staff can check according to the value measured by the second pressure gauge 144 to determine whether the pressure of the test gas entering the air chamber 112 reaches the second predetermined pressure value. The staff can check according to the value measured by the third pressure gauge 145 to determine whether the pressure of the test gas entering the coolant chamber 113 reaches the third predetermined pressure value.

[0094] Please refer to Figure 1 In this embodiment, the test device 13 further includes an eighth pipeline 128 and an eighth valve 140. One end of the eighth pipeline 128 is connected to the first pipeline 121, and the other end of the eighth pipeline 128 is connected to the third pipeline 123 and the fifth pipeline. The eighth valve 140 is arranged on the eighth pipeline 128, and the eighth valve 140 is used to control the on-off of the eighth pipeline 128. When the eighth valve 140 is closed, it can prevent the gases in the first pipeline 121, the third pipeline 123 and the fifth pipeline 125 from being connected to each other through the eighth pipeline 128, thereby affecting the normal operation of the hydrogen chamber 111, the air chamber 112 or the cooling liquid chamber 113.

[0095] Please refer to Figure 1 In this embodiment, the testing device 13 further includes a second one-way valve 147, which is disposed on the eighth pipeline 128. It is understandable that the second one-way valve 147 further prevents the gas in the third pipeline 123 and the fifth pipeline 125 from flowing into the first pipeline 121 through the eighth pipeline 128.

[0096] Please refer to Figure 1 In this embodiment, the testing device 13 also includes a coolant circulation unit 149, a ninth pipeline 129, a tenth pipeline 130, a ninth valve 141 arranged on the ninth pipeline 129, and a tenth valve 142 arranged on the tenth pipeline 130. One end of the ninth pipeline 129 is connected to the fifth pipeline 125, and the other end of the ninth pipeline 129 is connected to the liquid outlet of the coolant circulation unit 149. One end of the tenth pipeline 130 is connected to the sixth pipeline 126, and the other end of the tenth pipeline 130 is connected to the liquid inlet of the coolant circulation unit 149. The ninth valve 141 can control the on-off of the ninth pipeline 129, and the tenth valve 142 can control the on-off of the tenth pipeline 130.

[0097] In this way, when conducting a conventional power generation performance test of the fuel cell stack, the coolant circulation unit 149 is started, the ninth valve 141 and the tenth valve 142 are opened, the fifth valve 137 and the sixth valve 138 are disconnected, and the coolant can enter the liquid inlet of the cooling liquid chamber 113 through the ninth pipeline 129, flow out from the liquid outlet of the cooling liquid chamber 113, and re-enter the coolant circulation unit 149 through the tenth pipeline 130 to realize a cooling cycle, reduce the temperature inside the fuel cell stack 11, and protect the fuel cell stack 11.

[0098] When conducting relevant air tightness tests, the coolant circulation unit 149 can be stopped, the ninth valve 141 and the tenth valve 142 can be closed, the fifth valve 137 and the sixth valve 138 can be opened, and a certain gas flow rate, such as 20L / min, can be set through the flow regulator 148 to allow the gas to enter the fifth pipeline 125 through the seventh pipeline 127 and the eighth pipeline 128 to discharge the coolant in the battery stack 11. When no liquid is discharged from the sixth pipeline 126, the gas flow rate is set to 0L / min through the flow regulator 148, and then the corresponding test can be carried out according to the air tightness test requirements.

[0099] The testing device 13 further includes an eleventh valve 150 , which controls the on-off of the gas source 2 to the third pipeline 123 .

[0100] The above description is only a specific embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fuel cell stack testing device with an online air tightness detection function, comprising an air tightness detection unit (12) for testing the air tightness of a fuel cell stack (11), wherein the fuel cell stack (11) has a hydrogen cavity (111), an air cavity (112) and a coolant cavity (113) that are isolated from each other, and characterized in that: The airtightness detection unit (12) in the testing device (13) comprises: a first pipeline (121) that can be switched on and off, one end of the first pipeline (121) being used to communicate with the gas inlet of the hydrogen chamber (111); a second pipeline (122) that can be switched on and off, one end of the second pipeline (122) being used to communicate with the gas outlet of the hydrogen chamber (111); a third pipeline (123) that can be switched on and off, one end of the third pipeline (123) being used to communicate with the air inlet of the air cavity (112); a fourth pipeline (124) that can be switched on and off, one end of the fourth pipeline (124) being used to communicate with the air outlet of the air cavity (112); a fifth pipeline (125) that can be switched on and off, one end of the fifth pipeline (125) being used to communicate with the inlet of the cooling liquid chamber (113); a sixth pipeline (126) that can be switched on and off, one end of the sixth pipeline (126) being used to communicate with the outlet of the cooling liquid chamber (113); a seventh pipeline (127), one end of the seventh pipeline (127) being used for selectively communicating with the gas source (2) or the hydrogen source (31), and the other end of the seventh pipeline (127) being simultaneously communicated with the other end of the first pipeline (121), the other end of the third pipeline (123), and the other end of the fifth pipeline (125); The seventh pipeline (127) is in communication with the hydrogen source (31) for use in detecting the power generation performance of the fuel cell stack; The seventh pipeline (127) is used for gas tightness detection of the fuel cell stack when it is connected to the gas source (2); The other end of the fifth pipeline (125) is in communication with an air source (32) for use in detecting the power generation performance of the fuel cell stack; The proportional valve (132) provided on the seventh pipeline (127) is used to adjust the gas pressure in the seventh pipeline (127); A flow meter (131) disposed on the seventh pipeline (127) is used to test the gas flow in the seventh pipeline (127); The number of the proportional valves (132) is at least two, and at least two of the proportional valves (132) are arranged in parallel on the seventh pipeline (127), and the maximum values ​​of the gas pressures that can be adjusted by the two proportional valves (132) are different; The number of the flow meters (131) is at least two, and at least two of the flow meters (131) are arranged in parallel on the seventh pipeline (127), and the flow meters (131) have different measuring ranges.

2. The stack testing device with online airtightness detection function according to claim 1, characterized in that: The airtightness detection unit (12) further comprises a first valve (133), a second valve (134), a third valve (135), a fourth valve (136), a fifth valve (137), a sixth valve (138) and a seventh valve (139), wherein the first valve (133) is arranged on the first pipeline (121) and is used to control the on-off of the first pipeline (121), the second valve (134) is arranged on the second pipeline (122) and is used to control the on-off of the second pipeline (122), and the third valve (135) is arranged on the third pipeline (123) and is used to control the on-off of the second pipeline (122). The fourth valve (136) is arranged on the fourth pipeline (124) and is used to control the on-off of the fourth pipeline (124). The fifth valve (137) is arranged on the fifth pipeline (125) and is used to control the on-off of the fifth pipeline (125). The sixth valve (138) is arranged on the sixth pipeline (126) and is used to control the on-off of the sixth pipeline (126). The seventh valve (139) is arranged on the seventh pipeline (127) and is used to control the on-off of the seventh pipeline (127).

3. The stack testing device with online air tightness detection function according to claim 1, characterized in that: The airtightness detection unit (12) further comprises a first pressure gauge (143), a second pressure gauge (144) and a third pressure gauge (145); the first pressure gauge (143) is arranged on the first pipeline (121) and is used to test the pressure value of the gas at the inlet of the hydrogen chamber (111) connected to the first pipeline (121); the second pressure gauge (144) is arranged on the third pipeline (123) and is used to test the pressure value of the gas at the inlet of the air chamber (112) connected to the third pipeline (123); and the third pressure gauge (145) is arranged on the fifth pipeline (125) and is used to test the pressure value of the gas at the inlet of the cooling liquid chamber (113) connected to the fifth pipeline (125).

4. The stack testing device with online airtightness detection function according to claim 1, characterized in that: The air tightness detection unit (12) further comprises a first one-way valve (146), wherein the first one-way valve (146) is arranged on the seventh pipeline (127), and the first one-way valve (146) is used to prevent air from the air source (32) from flowing into the seventh pipeline (127) during a fuel cell stack performance test.

5. The stack testing device with online airtightness detection function according to claim 1, characterized in that: The airtightness detection unit (12) further comprises an eighth pipeline (128) and an eighth valve (140); one end of the eighth pipeline (128) is connected to the first pipeline (121); the other end of the eighth pipeline (128) is connected to the third pipeline (123) and the fifth pipeline (125); the eighth valve (140) is arranged on the eighth pipeline (128); and the eighth valve (140) is used to control the on-off of the eighth pipeline (128).

6. The stack testing device with online airtightness detection function according to claim 5, characterized in that: The airtightness detection unit (12) further comprises a second one-way valve (147), wherein the second one-way valve (147) is arranged on the eighth pipeline (128), and the second one-way valve (147) is used to prevent the fluid in the third pipeline (123) and the fifth pipeline (125) from flowing into the first pipeline (121) through the eighth pipeline (128).

7. The stack testing device with online airtightness detection function according to claim 1, characterized in that: The airtightness detection unit (12) further comprises a flow regulator (148), wherein the flow regulator (148) is arranged on the seventh pipeline (127) and is used to regulate the flow of gas in the seventh pipeline (127).

8. A stack test system with an online air tightness detection function, characterized in that: A test device (13) comprising any one of claims 1 to 7, used for testing the air tightness and power generation performance of a fuel cell stack (11).

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